make timestamp persistent

playbooks/edx-east/splunk_config_backup.yml

@@ -7,8 +7,9 @@
     splunk_config_archive: "{{ splunk_host }}-{{ date }}.tar.gz"
     splunk_s3_backup_tempdir: "/var/tmp"
     splunk_s3_bucket: "{{ splunk_s3_backups_bucket }}"
-    date: "{{ lookup('pipe', 'date +%Y-%m-%dT%H%M') }}"
   tasks:
+    - set_fact:
+        date: "{{ lookup('pipe', 'date +%Y-%m-%dT%H%M') }}"
     - name: archive splunk configuration dir
       command: tar -cpzf  "{{ splunk_s3_backup_tempdir }}/{{ splunk_config_archive }}" {{ splunk_config_dir }}
     - name: copy tarball to s3 bucket